Fix UpdateTilePriorities viewport in Android WebView.

cc/layers/picture_layer_impl_unittest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/layers/picture_layer_impl.h"
 
 #include <utility>
 
 #include "cc/debug/test_web_graphics_context_3d.h"
 #include "cc/layers/append_quads_data.h"
@@ skipping 223 matching lines @@
 
   EXPECT_EQ(pending_layer_->tilings()->num_tilings(),
             active_layer_->tilings()->num_tilings());
 
   const PictureLayerTilingSet* tilings = pending_layer_->tilings();
   EXPECT_GT(tilings->num_tilings(), 0u);
   for (size_t i = 0; i < tilings->num_tilings(); ++i)
     VerifyAllTilesExistAndHavePile(tilings->tiling_at(i), active_pile.get());
 }
 
+TEST_F(PictureLayerImplTest, SuppressUpdateTilePriorities) {
+  gfx::Size tile_size(100, 100);
+  gfx::Size layer_bounds(400, 400);
+
+  scoped_refptr<FakePicturePileImpl> pending_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+  scoped_refptr<FakePicturePileImpl> active_pile =
+      FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
+
+  SetupTrees(pending_pile, active_pile);
+
+  Region invalidation;
+  AddDefaultTilingsWithInvalidation(invalidation);
+  EXPECT_TRUE(host_impl_.manage_tiles_needed());
+  host_impl_.ManageTiles();
+  EXPECT_FALSE(host_impl_.manage_tiles_needed());
+
+  // Setting this boolean should cause an early out in UpdateTilePriorities.
+  bool valid_for_tile_management = false;
+  host_impl_.SetExternalDrawConstraints(gfx::Transform(),
+                                        gfx::Rect(layer_bounds),
+                                        gfx::Rect(layer_bounds),
+                                        valid_for_tile_management);
+  active_layer_->UpdateTilePriorities();
+  EXPECT_FALSE(host_impl_.manage_tiles_needed());
+
+  valid_for_tile_management = true;
+  host_impl_.SetExternalDrawConstraints(gfx::Transform(),
+                                        gfx::Rect(layer_bounds),
+                                        gfx::Rect(layer_bounds),
+                                        valid_for_tile_management);
+  active_layer_->UpdateTilePriorities();
+  EXPECT_TRUE(host_impl_.manage_tiles_needed());
+}
+
 TEST_F(PictureLayerImplTest, ClonePartialInvalidation) {
   gfx::Size tile_size(100, 100);
   gfx::Size layer_bounds(400, 400);
   gfx::Rect layer_invalidation(150, 200, 30, 180);
 
   scoped_refptr<FakePicturePileImpl> pending_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
   scoped_refptr<FakePicturePileImpl> active_pile =
       FakePicturePileImpl::CreateFilledPile(tile_size, layer_bounds);
 
@@ skipping 783 matching lines @@
   active_layer_ = static_cast<FakePictureLayerImpl*>(
       host_impl_.active_tree()->LayerById(id_));
 
   EXPECT_EQ(0u, active_layer_->num_tilings());
   EXPECT_EQ(!default_lcd_text_setting, active_layer_->is_using_lcd_text());
   EXPECT_FALSE(active_layer_->needs_post_commit_initialization());
 }
 
 }  // namespace
 }  // namespace cc